The extension of WatchTower app allows you to add multiple Trello boards as sources to view, comment and track Trello cards from your Jira instance.
Configuring several Trello platforms as sources to pull data from.
You can view, comment, and transition Trello cards from your Jira board;
Add comments remotely to your Trello board.
Atlassian SDK, Jira API, REST API, Trello API, Angular JS